Intelligent pigging of pipeline internal for water/ gas/oil

[rajenmenon13]

Is there any international standard for frequencey of intelligent pigging of pipe - Internal carrying water/oil/gas.

If so can you please share the same.

 

[LittleInch]

Not AFAIK. There is a "default" period of between 5 and 7 years and various countries have legislation that require internal inspection every so many years, normally 5. Why 5? - this seems to be a sensible compromise between the cost of inspections versus the risk that a corrosion defect can increase to the point of leak / rupture before the next inspection. Intelligent pigging should be complimentary to other forms of corrosion inhibition - injection of Corrosion inhibitor, CP, checks on the coating integrity.

Frequency of internal inspection is very dependant on the nature of your product, how corrosive it is, what the risks are from leakage and past history of inspections, e.g. you do a run in y1, you do the second in Y6. If this shows up defects which are OK in Y6, but predicted not to be in Y9, then you do a run in Y9. If the defects you leave in Y6 are minor then you can argue not to do it until Y13 or 14.

If you change products to a more corrosive one then you might decrease the time between inspections.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way